1  /*
 2   * Copyright (C) 2012-2019 Apple Inc. All rights reserved.
 3   *
 4   * Redistribution and use in source and binary forms, with or without
 5   * modification, are permitted provided that the following conditions
 6   * are met:
 7   *
 8   * 1.  Redistributions of source code must retain the above copyright
 9   *     notice, this list of conditions and the following disclaimer.
10   * 2.  Redistributions in binary form must reproduce the above copyright
11   *     notice, this list of conditions and the following disclaimer in the
12   *     documentation and/or other materials provided with the distribution.
13   * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
14   *     its contributors may be used to endorse or promote products derived
15   *     from this software without specific prior written permission.
16   *
17   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27   */
28  
29  #include "config.h"
30  #include "JSSymbolTableObject.h"
31  
32  #include "JSCInlines.h"
33  #include "PropertyNameArray.h"
34  
35  namespace JSC {
36  
37  const ClassInfo JSSymbolTableObject::s_info = { "SymbolTableObject", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSSymbolTableObject) };
38  
39  void JSSymbolTableObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
40  {
41      JSSymbolTableObject* thisObject = jsCast<JSSymbolTableObject*>(cell);
42      ASSERT_GC_OBJECT_INHERITS(thisObject, info());
43      Base::visitChildren(thisObject, visitor);
44      visitor.append(thisObject->m_symbolTable);
45  }
46  
47  bool JSSymbolTableObject::deleteProperty(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, DeletePropertySlot& slot)
48  {
49      JSSymbolTableObject* thisObject = jsCast<JSSymbolTableObject*>(cell);
50      if (thisObject->symbolTable()->contains(propertyName.uid()))
51          return false;
52  
53      return Base::deleteProperty(thisObject, globalObject, propertyName, slot);
54  }
55  
56  void JSSymbolTableObject::getOwnSpecialPropertyNames(JSObject* object, JSGlobalObject* globalObject, PropertyNameArray& propertyNames, DontEnumPropertiesMode mode)
57  {
58      VM& vm = globalObject->vm();
59      JSSymbolTableObject* thisObject = jsCast<JSSymbolTableObject*>(object);
60      {
61          ConcurrentJSLocker locker(thisObject->symbolTable()->m_lock);
62          SymbolTable::Map::iterator end = thisObject->symbolTable()->end(locker);
63          for (SymbolTable::Map::iterator it = thisObject->symbolTable()->begin(locker); it != end; ++it) {
64              if (mode == DontEnumPropertiesMode::Include || !it->value.isDontEnum()) {
65                  if (it->key->isSymbol() && !propertyNames.includeSymbolProperties())
66                      continue;
67                  propertyNames.add(Identifier::fromUid(vm, it->key.get()));
68              }
69          }
70      }
71  }
72  
73  } // namespace JSC